40521750021 has 24 divisors (see below), whose sum is σ = 60146367320. Its totient is φ = 26269940736.

The previous prime is 40521750019. The next prime is 40521750023. The reversal of 40521750021 is 12005712504.

It is an interprime number because it is at equal distance from previous prime (40521750019) and next prime (40521750023).

It can be written as a sum of positive squares in 4 ways, for example, as 586124100 + 39935625921 = 24210^2 + 199839^2 .

It is not a de Polignac number, because 40521750021 - 2¹ = 40521750019 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40521750023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 591225 + ... + 656193.

Almost surely, 2^40521750021 is an apocalyptic number.

It is an amenable number.

40521750021 is a deficient number, since it is larger than the sum of its proper divisors (19624617299).

40521750021 is a wasteful number, since it uses less digits than its factorization.

40521750021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66885 (or 66882 counting only the distinct ones).

The product of its (nonzero) digits is 2800, while the sum is 27.

The spelling of 40521750021 in words is "forty billion, five hundred twenty-one million, seven hundred fifty thousand, twenty-one".